dvds wont work

[frodox]

hey i have the pioneer 16x dual layer dvd burner
i use the dvd decrypter n rip it to my hard drive
then i use clone dvd to burn the dvds
the dvds play in my comp, and on the panasonic dvd player in the livin room
but the koss dvd player (just purchased) which has mp3 and all that blah blah doesnt play it. also my friends centrios dvd player doesnt play the dvd's

why is that? and is there something i can do to make the dvds work or burn a different way to make the dvds work?

i just copy the dvds i buy n the originals go in the basement, the copied litterally fly around the house!lol